# Question about momentum unit and its conversion to energy.

## Main Question or Discussion Point

Hello.

I'm reading some accelerator physics paper showing the momentum unit for the accelerated particles as MeV/c.

I'm not interested in the momentum but energy thus I really want to convert this to energy.

How it is done? Simply multiplying c? if so, there must be some reason for justify the action.

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Dale
Mentor
Momentum, energy, and mass are related by $m^2 c^2=E^2/c^2-p^2$

jtbell
Mentor
Or, the way I like to remember it: $E^2 = (pc)^2 + (mc^2)^2$.

E, pc and mc2 all have units of energy (MeV or joules or whatever)

Oh thanks people!

Thus..since momentum in the paper is, for example, 0.79 MeV/c so pc should be simply the momentum multiplied by c, 0.79 MeV right?

jtbell
Mentor
Right.